Improvement in hot-air furnaces



SLATER @L PLATT.

HotfAir Furnace.

\ Patented Oct. 27, 1868.

\ IMM/5555:

ELI SLA'IER, AND ANSON H. PLATT, OE PHILADELPHIA, PENN* SYLVANIA.

Lenmlam: No. 83,415, .zaad october 27, 186s.

IMPROVEMENT IN HOT-AIR FURNACES,

To all whom it ma/y concern:

Beit known that we, VELI SLATER and Anson H. PLATT, of Philadelphia, in the county of Philadelphia, and State of Pennsylvania, have invented a new land improved Stove or Furnace for Heating; and we do hereby declare that the following is a'full and exact description thereof, `reference being had to the accom# panying drawings, making' part of this specification- Figure 1 being a central vertical section of a stove constructed with our improvement."

Figure 2, a transverse section of a modified construction of grate, adapted to oin` improved stove.

Figure 3, a front View of the lower part ofthe stove, as provided with the improved grate.

' Like letters designate corresponding parts in all of the figures'.

`rIhe object of our invention is to produces). stove or furnace with a downward draught through the fuel, so asto consume all the smoke and earbonaceous gases, and to produce the most intense heat at the .base of the stove, whereby a more desirable and uniform distribution of temperature may be obtained in the room.

In the simplest form of stove for the application of our invention, there are two concentric cylinders, c and o, with an annular radiating-space orchamber between/ wide `enough to allow a free circulation of the draught and products of combustion all aroiuid, beforepassing off at the exit-pipe c. At the bottom of the inner cyl inder a is the fire-grate g, beneath which is a close base,

b, that receives the ashes, and into which the draught and products of combustion descend. The annular space between thc cylinders also communicates with the base, b, through the openings fj, so that the' draughtI freely passes4 up therein on all sides. A door (or doors) It, opens into the base, for gaining admission thereto, and there may be an opening or openings in the door, cont-rolled by a register, my, (iig. 1,) through which to admit air, when desired. The annular space between. the cylinders 'is closed at the top andon all sides.

The top of thc inner c ylimler,`avis closed by a cover," d, which has periin'ations, through which the air to sup-V port combustion is ordinarily admitted.'

lf the stove is intended for burning coal, the `inner cylinder or tire-chamber has the usual lining, for protection.

' The above are the essential features of construction,

but they may be varied in form or otherwise, so long as the principle of operation is retained.

Thefuel is introduced at the top, and the cover (l is replaced. The fire may be kindled on the grate, with air admitted below through the base," 7), but as soon as the fuel is sufficiently kindled, the draught-passage below is entirely closed, and air to support combustion is only admitted at the top. Thus all the smoke and carbonaceous gases are forced, with the air, down through the biu'ning` fuel, and their combustion is perfectly effected. carried down into the base, 1), thence to be radiated near the iioor, where the greatest heat is required, but

seldom obtained. Finally, the heated products are carried upward into the annular space between the cylinders, and radiated from all sides of the large surface of the outer cylinder, most intensely atthe bottom, and gradually less towards the top, just as most desirable.

In large stoves, this method of combustion subjects the grate ,f/.to intense heat, rendering it liable to be destroyed. To avoid this eiiect, iu such cases wc contemplate making the grate-bars hollow, (as shown in iig. 2,) and admitting cold air therein at one (say the front) end, as shown at i in iig. 3. The air is conducted through their length, to the rear end, andA is there introduced, through openings, into the fire. Thus the grate-bars are kept comparatively cool, anda heated draught of .air admitted to the lower part of the fuel, just where desired, to perfectly complete the combustion.

What we claim as our invention, and desire to secure by. Letters Patent, is-

lhe combination 'of the inner combustion-cylinder or chamber a', outer radiating-cylinder or chamber o, surrounding .the same, and the close base, b, all constructed and arranged so that the ih'auglit and products .of combustion pass down from the irst, through the fire-grate g, into the base, and tl'ieneelup through the space between the two cylinders, substantially as and' ,for the pmposes herein specified.

ELI SLATER. ANSON H. PLAIT.

Witnesses:

GAssiUs L. PLATT, SAMUEL C. OGLE.- s

At the same' time, the principal heat is first' 

